基于FPGA的超声相控阵发射系统设计

摘要

In order to make underwater acoustic imaging system miniaturization,combine phased-array technology with underwater ultrasonic imaging technology originally,the ultrasonic phased array transmitting system based on FPGA is designed.The transmitting principle of phased focus is analyzed,and the six channels ultrasonic phased array transmitting system is achieved by using FPGA with rich I/O pins and internal logic resources.Then the signal conditioning circuit for excitation signal D/A conversion and amplification are designed to motivate the piezoelectric transducer effectively.The actual test results show that the system achieved ultrasonic signal phased array focus transmitting,phase delay precision is 2.5 ns.The system with high integration and stable transmitting signal,which provide a new way for the underwater ultrasonic imaging,it has high application value.%为使水声成像系统小型化,首创性地提出了将相控阵技术和水下超声成像技术结合在一起,设计了一种基于FPGA的超声相控阵发射系统.对相控聚焦的发射原理进行了分析,利用FPGA的内部逻辑资源和丰富的I/O引脚实现了6通道超声相控阵发射,为有效激励压电换能器设计了信号调理电路对激励信号进行D/A转换及放大.通过实验测试表明,该系统可以实现超声信号的相控发射,相控延时精度达到2.5 ns,发射信号稳定,系统集成度高,为水下超声成像提供了一种新的途径,具有较强的应用价值.